Related Clues:

• The Eagles, to the Giants
• Aaron Burr, to Alexander Hamilton, at least that one time
• Philistines, to the Israelites
• Adversary with golfer's shout not right
• One alternative of a sentry's challenge
• Match in ability
• One to vie with
• The Riddler, to Robin
• Main competitor
• Avis, to Hertz
• Fischer, to Spassky, e.g
• One of 64-Across
• Navratilova, to 45-Across, e.g
• Eton, to Harrow
• 26-Across, to Maxwell Smart